Improvement in clevis foe plows



D. STEWART.

Plow Clevs. No. 82,764. l Patented Oct. 6, 1.868.

Wue'ses" Y fray/@Jrn @me e f/ MPETERS, PHom-UTHOGRAFMgR, WASHINGWN D C Davins'rswnnfr, 0F GORI'NNA, MAINE.`

Letters Patent No. 82,764, dated October 6, 186,8.

IMPROVEMENT IN @LEVIS FOR PLOWS.

I @the dgehule refeereh te in tlgeee etters ietent mit making met et the same. Y

TO ALL WHOM IT MAY CONGERN:

Be it known that I, DAVID STEWART, of Corinna, in4 the county of Penobscot, and State of Maine, have invented a certain new and useful Improvement in a Cl'evis for Plows and for other purposes; and the following is a full, clear, and exact description of the, same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 represents a perspective view of my improvement in clevises, as attached to a plow-beam-a broken-ofi` section. v

Figure 2 shows a side view of beam and a clevis, with a. stirrup for adjusting the side draught f the plow. The object of my invention is to adjust-the depth Vof the draught of a plow, and also the side draught, to the greatest nicety, in the easiest. and most efficient manner.

My invention consists in combining with a spiral shaft and link, in a clevis, for adjusting the depth of av plow, aimetal plate, with a ciicular slot, clamp, bolt, and nut, or its equivalent, for adjusting the side draught.

To enable others tov make and use myimproved clevis, I will describe it more fully, referring to the drawings, and to the letters marked thereon.

I take a flat bar of iron'or steel, of sufficient width and thickness to make the clevis, forge the central portion'into a round bar, A, about thelength of the thickness ofthe plow-beam B, then turn the ilat ends a a,

having previously punched them, to receive the wrench-bolt, b, and clamp-bolt c, so that the flat bars a a will be parallel, and pass easily on to the end of the beam g Between the flat barsl a a, I place, near the vertical round bar A, a spiral stud or shaft, D, the thread'or worm being suiiiciently wide apart to leave an opening between it and the bar A to receive a ring or link, E, to' which the draught-chain is attached, for plowing, Etc., the link E being held by the thread d d on the spiral shaft D, so as to retain it in any place on the bar A, from moving up or down, the spiral --shaft D being provided with journals, so as to turn in the clevis, and change the position of the link E from the top to the bottom, and also a set-nut, e, to hold it firmly fixed in any position. I

On the top of the beam B, -I secure a. plate of metal, F, it having a circular slot, f, having for its centre the bolt', which plate projects over the front end of the beam B a sucient distance to admit of'a clamp-bolt, C, and nut c, by which thc side draught of the plow may be adjusted to a great nicety. i

Another mode of adjusting the side draught is shown in tig. 2, by having the fiat bars a a of the cl'evis extend back ofthe bolt b, on the beam B, audjhaving a stirrup, G, around the beam, and a clamp-plate and nuts, 7e, tn secure it when placed in any desired position, to effect the side'draught. When the clevis is constructed and secured in this manner, the slotted plate F and clamp-boltmay be dispensed with.

W'hat I claim as my invention, and desired to secure by Letters Patent, is-

In combination with the spiral shaft D and link E, the slotted plate F, clamp-bolt C, and nut on the stirrup G, for adjusting the side draught, as herein set forth.

Iu testimony whereof, Ihereunto subscribe my name in the presence of- DAVID STEWART.

' 'Witnessesz VoLNEY A. Seit/esule, C. H. MORSE. 

